Active noise control system using upper computer to achieve real-time offline update

Abstract

The invention discloses an active noise control system using an upper computer to achieve real-time offline update, and belongs to the technical field of active noise control. The active noise controlsystem using the upper computer to achieve real-time offline update has better self-adaptability and has stronger re-control ability to respond to noise environment changes. Through the system, the link of update iteration of a control filter, occupying most hardware implementation resources, in the active noise control system can be separated from a controller, the part is transmitted to the upper computer for processing, and the hardware implementation pressure in the active noise control system is greatly saved. The active noise control system uses a cheaper hardware implementation platform, and the implementation cost is saved; and the saved hardware resources are used for increasing the coefficient length of the control filter, the part, which needs to increase the system computational complexity, of an improved algorithm with the higher computational complexity is used, and a better noise suppression effect is obtained.

Description

technical field [0001] The invention belongs to the field of active noise control, and in particular relates to the design of an active noise control system utilizing a host computer for off-line update. Background technique [0002] Noise control techniques can be divided into two categories, namely passive noise control and active noise control. Due to limitations such as cost and deployment methods, passive noise control technology is not efficient in suppressing low-frequency noise. The human ear is more sensitive to low-frequency noise, so active noise control technology that can effectively suppress low-frequency noise has received more and more attention. The noise reduction principle of active noise control technology originates from the interference phenomenon of sound waves. After analyzing the noise to be processed, the electro-acoustic device emits an "anti-noise" with the same amplitude and opposite phase as the noise to offset at the designated position throu...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of excessive calculation amount of the system due to the use of improved algorithms and increasing the number of channels in the active noise control system, and proposes to implement the adaptive control update iteration process and noise reduction hardware The technical design method of platform separation provides a new active noise control system that uses the host computer to update offline

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